[log4j] New broken tests in master: LogstashIT

[Matt Sicker]

These tests are failing on macOS with a connection error of some sort.
Not sure if it fails on other operating systems, but it reliably fails
early enough in the macOS builds to cancel the others, and it fails
for me locally as well. Possible cause could be related to JUnit
dependency updates if there was a race condition involving finding
available ports or something, though I haven't looked too closely at
what's the issue.